The URL of the portal from which this local item was downloaded. This property can be used in conjunction with the LocalItem.originalPortalItemId to find the URL of the portal from which this local item was downloaded. This can be useful when following offline map workflows as it allows you to find the URL of the online webmap.
Executes an asynchronous operation to update any item properties that have been changed (using the setter methods). This causes the values that have been changed to be updated on the portal (for PortalItems) or on disk (for LocalItems).